Circuit Documentation

Summary

This circuit is designed to control an AC bulb using an ESP32 microcontroller, which interfaces with a relay module, an OLED display, and touch sensors. The ESP32 controls the relay to switch the AC bulb on or off, receives touch input, and displays information on the OLED screen. The LED and resistor are used as an indicator, likely for power or status.

Component List

ESP32 (30 pin)

• Microcontroller with WiFi and Bluetooth capabilities.
• 30 GPIO pins including analog inputs, digital IOs, power, and ground.

Touch Sensor

• Capacitive touch sensor with IO, VCC, and GND pins.

OLED Display (128x32)

• Small screen for displaying text and graphics.
• Communicates with the ESP32 via I2C (SDA and SCL).

LED (White, Two Pin)

• A simple white LED with an anode and cathode.

Resistor

• A 220 Ohm resistor, likely used to limit current to the LED.

1 Channel 5V Relay Module

• A relay module for controlling high power devices.
• Has pins for VCC, GND, signal input, and switch contacts (N.O., COM, N.C.).

AC Bulb

• A standard AC bulb with positive and negative terminals.

120V Outlet

• An outlet to provide AC power to the bulb.

Wiring Details

ESP32 (30 pin)

• D13 connected to Relay Module (signal input)
• GND connected to common ground net
• Vin connected to Relay Module VCC+
• D22 (SCL) connected to OLED Display SCL
• D21 (SDA) connected to OLED Display SDA
• D4 connected to LED anode
• D2 connected to Touch Sensor IO (first sensor)
• D15 connected to Touch Sensor IO (second sensor)
• 3V3 connected to VCC net for Touch Sensors and OLED Display

Touch Sensor

• IO connected to ESP32 (D2 for the first sensor, D15 for the second sensor)
• VCC connected to 3V3 net from ESP32
• GND connected to common ground net

OLED Display (128x32)

• SDA connected to ESP32 D21
• SCL connected to ESP32 D22
• VCC connected to 3V3 net from ESP32
• GND connected to common ground net

LED (White, Two Pin)

• Anode connected to ESP32 D4
• Cathode connected to one end of the Resistor

Resistor

• One end connected to LED cathode
• Other end connected to common ground net

1 Channel 5V Relay Module

• IN connected to ESP32 D13
• VCC+ connected to ESP32 Vin
• VCC- (GND) connected to common ground net
• N.O. connected to AC Bulb P
• COM connected to 120V Outlet AC Hot

AC Bulb

• P connected to Relay Module N.O.
• N connected to 120V Outlet AC Neutral

120V Outlet

• AC Neutral connected to AC Bulb N
• AC Hot connected to Relay Module COM

Documented Code

No code was provided for the microcontroller. The expected functionality would include initializing the GPIO pins, setting up the I2C communication for the OLED display, reading touch sensor inputs, and controlling the relay to turn the AC bulb on or off based on the touch sensor inputs or other logic. Additionally, the code would handle updating the OLED display with relevant information such as system status or touch sensor states.